SOPRASMART BOARD 180 is a high performance panel of an SBS-modified bitumen base membrane and SOPRABOARD asphaltic cover board for use in approved multi-ply membrane assemblies. To create SOPRASMART BOARD 180, a semi rigid, asphaltic roofing substrate board is factory laminated to an SBS modified bitumen base ply reinforced with a tough, dimensionally stable non-woven polyester mat for creating a time and labor-saving solution. The topside is surfaced with polyolefin burn-off film to optimize heat welding applications.